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Return to NMR Spectroscopy in Inorganic Chemistry 2e Student resources
Chapter 1 Multiple Choice Questions
Fundamentals
*
not completed
.
Consider the following isotopes: 1H, 2H, 12C, 13C, 14N, 15N, 16O, 17O, 19F, 31P, 61Ni, 195Pt. Which nuclei will be NMR inactive (i.e., not suitable for NMR measurements)?
2
H,
12
C,
14
N,
16
O
correct
incorrect
2
H,
12
C,
15
N,
17
O,
19
F,
31
P,
61
Ni,
195
Pt
correct
incorrect
12
C,
16
O
correct
incorrect
12
C,
16
O,
61
Ni
correct
incorrect
*
not completed
.
How many possible orientations can a spin 1 nuclei adopt when placed in an applied magnetic field?
1
correct
incorrect
2
correct
incorrect
3
correct
incorrect
4
correct
incorrect
*
not completed
.
What happens when a spin ½ nucleus is placed in a magnetic field and irradiated at the Larmor frequency?
The frequency of precession of the nucleus changes.
correct
incorrect
The nucleus spins faster.
correct
incorrect
Transitions are excited between spin energy levels.
correct
incorrect
No changes occur.
correct
incorrect
*
not completed
.
Consider the following trigonal bipyramidal molecule SbF
3
Ph
2
, in which one fluorine is in an equatorial position, and the other two are in the axial positions.
How many resonances should one expect to observe in the
19
F NMR spectrum, assuming the molecule is not fluxional?
1
correct
incorrect
2
correct
incorrect
3
correct
incorrect
4
correct
incorrect
*
not completed
.
Consider the magnitude of chemical shielding and scalar coupling. Which observations are correct?
The magnitude of chemical shielding varies with the strength of the spectrometer field, while scalar coupling is field-independent.
correct
incorrect
The magnitudes of both chemical shielding and scalar coupling vary with the strength of the spectrometer field.
correct
incorrect
The magnitudes of chemical shielding and scalar coupling do not depend on the spectrometer field.
correct
incorrect
The magnitude of chemical shielding is field-independent, while scalar coupling varies with strength of the spectrometer field.
correct
incorrect
*
not completed
.
The chemical shift of the residual hydrogen in deuterated water is δ 4.65. How many hertz downfield from the tetramethylsilane (TMS) signal will the resonance appear in a spectrum taken on a spectrometer operating at 500 MHz for
1
H frequency?
465 Hz
correct
incorrect
525 x 10
3
Hz
correct
incorrect
2325 Hz
correct
incorrect
2.325 x 10
9
Hz
correct
incorrect
*
not completed
.
[Rh(PCy
3
)
3
Br] has square planar geometry. Two of the phosphines are mutually
trans
, (P
A
); the third phosphine (P
B
) is
trans
to a bromide. Describe the splitting pattern of the
103
Rh NMR resonance. Cy = cyclohexyl.
A doublet of doublets is observed due to rhodium coupling to groups P
A
and
P
B
.
correct
incorrect
All three phosphines couple equally to the rhodium giving a quartet.
correct
incorrect
A triplet of doublets is observed due to rhodium coupling to group P
A
containing two magnetically equivalent PPh
3
ligands with coupling constant
1
J
RhP
A
and to P
B
, coupling constant of
1
J
RhP
B
.
correct
incorrect
A singlet is observed.
correct
incorrect
*
not completed
.
Consider the
31
P NMR spectrum of square planar
trans
-[PtCl
2
(PPh
3
)
2
]. Describe the splitting pattern observed on the
31
P NMR resonance?
A central singlet with satellites due to coupling to
195
Pt.
correct
incorrect
A triplet with satellites due to coupling to
195
Pt.
correct
incorrect
A singlet.
correct
incorrect
A doublet of doublets due to coupling to both
195
Pt and
31
P.
correct
incorrect
*
not completed
.
Predict the number of signals and the splitting pattern in the
1
H NMR spectrum of the solution of the BH
4
anion in D
2
O (the spin,
I
, of
10
B is 3 and of
11
B is 3/2):
One signal: a singlet.
correct
incorrect
One signal: a septet due to coupling of
1
H to
11
B.
correct
incorrect
Four signals: each of them is septet due to coupling of
1
H to
11
B.
correct
incorrect
One signal containing two patterns: a quartet due to coupling of
1
H to
11
B, and a septet due to coupling of
1
H to
10
B.
correct
incorrect
*
not completed
.
For quadrupolar nuclei, e.g.
11
B
an increase in the symmetry of the compound and temperature of the measurement results in narrowing of the signals.
correct
incorrect
a decrease in the temperature of the measurement results in narrowing the signals due to a decrease in the rate of quadrupolar relaxation.
correct
incorrect
an increase in the temperature of the measurements results in broadening of the signals.
correct
incorrect
an increase in the symmetry of the compound results in broadening of the signals due to a decrease in the rate of quadrupolar relaxation.
correct
incorrect
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